In 2022, Trey and Shelby Scharp applied for a building permit on land they already owned along Hoback's rural stretch of Teton County, and the county handed them a bill for $24,325 before they could break ground. Not for the septic system. Not for grading or erosion control. The charge came from the county's affordable and workforce housing mitigation fee, a line item that has nothing to do with the quality of a home's finishes and everything to do with a single number written into the land development regulations: the total floor area of the project.
The Scharps eventually got their money back, with interest, after suing the county in federal court. But the number that triggered their fee, and that will decide whether you owe one on your own new build or major addition, has already shifted once this year, and the legal and legislative fights that surrounded that shift ended in a settlement and a blocked bill rather than a ruling that settled anything for good. If you're budgeting a project anywhere in Teton County, this fee is not a fixed cost you look up once and forget. It's a line that moves, and where it sits when your permit is stamped can be the difference between owing nothing and owing tens of thousands of dollars.
The Number That Moved
For years, the exemption cutoff sat at 2,500 square feet of floor area. Build under that line and a homeowner owed nothing toward the mitigation fund. Build over it, and the county assessed a fee tied to a 2023 nexus study built on the premise that large new homes generate demand for service workers, contractors, landscapers, caretakers, who then compete for a housing supply the county cannot afford to lose.
On June 18, 2026, Teton County commissioners voted to raise that exemption from 2,500 to 3,000 square feet, according to reporting in the Jackson Hole News&Guide. A 500-square-foot swing sounds like a technicality until you look at what it took off the table. In 2025, single-family mitigation fees brought the county $453,914, and $86,588 of that came specifically from homes between 2,500 and 3,000 square feet, the exact band the county just exempted going forward. Roughly a fifth of last year's single-family fee revenue would not have been collected under the new rule.
Why 3,000, Not Some Other Number
Commissioners didn't arrive at 3,000 square feet through a new round of economic modeling on job creation. They picked it because it matches the threshold already written into Wyoming's Fast Track Permits Act, a state law from the prior legislative session meant to speed up permitting for smaller homes. Matching the county's own exemption to a number state lawmakers already approved reads less like an independent policy judgment and more like a defensive move, one that makes it harder for the legislature to gut the whole mitigation program in a future session.
The Town of Jackson has not made the same move. According to the town's planning director, Paul Anthony, the town's mitigation program carries no equivalent size exemption, so a qualifying project inside town limits owes the fee regardless of square footage. Part of the reasoning, per Mayor Arne Jorgensen, is that homeowners who want to build very large homes tend to do so outside town limits already, which changes the incentive calculus for the town compared to the county. The revenue swings back this up: the town's program had brought in $293,872 so far in 2026 from combined commercial and residential fees, compared with $910,585 for the full year in 2023, while the county's overall mitigation revenue, residential and commercial combined, ran $1.2 million in 2024 with $1.4 million budgeted for its 2026 fiscal year. Two adjacent jurisdictions, two different formulas, and a boundary line that can matter as much as your floor plan.
A Settlement That Didn't Settle the Question
The Scharps filed their federal lawsuit in May 2025, arguing through their attorneys at Pacific Legal Foundation that the fee amounted to an unconstitutional taking under the Fifth Amendment. Chief District Judge Kelly Rankin denied the county's motion to dismiss that September, and by December 2025 a three-day jury trial had been scheduled for September 21, 2026, in Cheyenne.
It never got there. In March 2026, before the case reached a jury, Teton County agreed to refund the Scharps $24,325 plus 7% interest, a total of $29,909, and issued a public apology admitting the fee should never have been charged. But the reason behind the refund matters. The Scharps' property included a 1,952-square-foot cabin, larger than the standard 1,000-square-foot cap the county places on accessory dwelling units, though it later received a historic designation that allowed it to count as one anyway. Once that cabin's square footage was properly subtracted from the project total, the floor area eligible for mitigation fell to 2,113 square feet, under the 2,500-square-foot threshold that applied at the time. The county conceded a math error specific to this property. It did not concede that the fee itself is unconstitutional, and the underlying question never had its day in court.
The same season brought a separate challenge in the state legislature. House Bill 141 would have banned local mitigation fees outright, but the debate became entangled in a campaign finance controversy after a Teton County Republican committeewoman handed out donor checks on the House floor on the session's opening day, checks later tied directly to the debate over the bill. The Senate ultimately voted 24-7 to block the measure from advancing further in March 2026. The fee survived that round too, though again on procedural grounds rather than a ruling that settled the debate. County officials have since said they are reviewing mitigation fees charged as far back as 2022 for similar historic-structure calculation errors, and attorneys at Pacific Legal Foundation have indicated they intend to keep challenging these fees wherever they surface.
Why the Fee Exists at All
None of this happens in a vacuum. Well under a tenth of the land in Teton County is privately held and available for development, the rest sits under federal ownership or conservation easement, which is exactly why officials treat every new large home as a meaningful event rather than a routine permit. The assumption, formalized in the county's 2023 nexus study, is that a new home of a certain size generates enough demand for supporting labor that it worsens a housing shortage the workforce is already priced out of. Whether that assumption holds up under legal and legislative scrutiny is precisely what's being argued right now, and the answer will keep shaping where the exemption line sits.
What This Means If You're Designing to the Line
If your plans are anywhere near the threshold, a few practical habits will save you from an unpleasant surprise:
- Confirm the current exemption directly with the county's Housing Department before finalizing square footage. The number changed once in 2026 already, and the pressure that produced that change hasn't gone away.
- Run your numbers through the county's downloadable Affordable Housing Mitigation Requirement Calculator rather than relying on a threshold you saw in an older article. The workbook gets updated regularly, and so does the policy behind it.
- If your parcel includes an older structure, a cabin, barn, or outbuilding, ask early whether it could reduce your project's countable floor area the way the Scharps' cabin eventually did. Document any historic designation carefully, since this is the exact calculation the county has admitted getting wrong before.
- If you pay mitigation fees at permit issuance and later decide not to build, Teton County's building permit fee schedule allows for a full refund of the Affordable Housing and Energy Mitigation Program fees, a useful backstop if your plans change mid-process.
- Treat the town and county as separate systems. A project just inside Jackson's town limits may owe a fee that an otherwise identical project on county land, under 3,000 square feet, would not.
A Few Questions Worth Asking
Does the fee apply to additions and remodels, or only new construction? The fee is assessed against the total floor area proposed in a building permit application, which is why a substantial addition, not just a ground-up build, can trigger it if the finished project crosses the exemption threshold. Confirm your specific renovation's status with the county's Housing Department rather than assuming a remodel is automatically exempt.
Is this only a county issue, or does the Town of Jackson charge something similar? Both jurisdictions run mitigation programs, but they aren't the same program. The town has no square footage exemption, so identical projects on either side of the town boundary can owe very different amounts.
Could the 3,000-square-foot line move again? It's a live possibility. The county aligned its exemption with a number already written into state law, likely to blunt further legislative action, but Pacific Legal Foundation has signaled it will keep challenging these fees, and Wyoming lawmakers have tried more than once to eliminate them outright. Treat today's threshold as current, not permanent.
If you're weighing new construction or a major addition in Jackson or elsewhere in Teton County and want a clear read on how these numbers affect your budget and timeline, Regan Peterman can walk you through the current figures and point you to the right people at the county before you commit to a design. Schedule a private consultation to talk through your project's potential.
